* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ====================================
   MOBILE FIRST - BASE STYLES
   ==================================== */
body {
    font-family: 'Inter', sans-serif;
}

.parent {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* HEADER - MOBILE FIRST */
.parent .header {
    background-color: #2c5282;
    color: white;
    display: flex;
    flex-direction: column;
    position: relative;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
}

#course-title {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 500;
    flex: 1;
}

/* HAMBURGER BUTTON - MOBILE FIRST */
#menu {
    font-size: 1.5rem;
    border: 0;
    background: none;
    color: white;
    cursor: pointer;
    padding: 0.5rem;
    transition: transform 0.3s ease;
}

#menu::before {
    content: "☰";
}

#menu.open::before {
    content: "✕";
}

/* NAVIGATION - MOBILE FIRST */
.parent .navigation {
    background-color: #3a3a3a;
    padding: 0;
}

.navigation {
    display: flex;
    flex-direction: column;
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.navigation.open {
    max-height: 500px;
}

.navigation li {
    display: flex;
}

.navigation a {
    color: white;
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.8rem;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
    border-bottom: 1px solid #2c5282;
}

.navigation li:last-child a {
    border-bottom: none;
}

.navigation a:hover {
    background-color: #2c5282;
}

/* MAIN TITLE - MOBILE FIRST */
.parent .title {
    text-align: center;
    padding: 1.5rem 1rem;
    font-size: 1.5rem;
    color: #333;
}

/* MAIN CONTENT - MOBILE FIRST */
main {
    width: 100%;
    padding: 0 1rem;
}

/* CONTENT GRID - MOBILE FIRST */
.content-boxes {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex: 1;
}

/* CARDS - MOBILE FIRST */
.card {
    border: 2px solid #2c5282;
    border-radius: 8px;
    overflow: hidden;
}

.card h2 {
    background-color: #2c5282;
    color: white;
    padding: 0.8rem;
    margin: 0;
    text-align: center;
    font-size: 1.2rem;
}

/* ABOUT ME CARD - MOBILE FIRST */
.about-me {
    padding: 0;
}

.about-me > *:not(h2) {
    padding: 0 1rem;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 1rem 1rem 0 1rem !important;
}

.about-content p {
    line-height: 1.6;
    font-size: 0.95rem;
}

.profile-img {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 4px;
    margin: 0 auto;
}

.about-me h3 {
    font-size: 1rem;
    margin: 0.8rem 0 0.5rem 0;
    text-align: center;
}

.quito-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1rem 0;
    align-items: center;
}

.flag-placeholder {
    width: 80px;
    height: 60px;
    background: linear-gradient(180deg, #ffd700 0%, #ffd700 50%, #0066cc 50%, #0066cc 75%, #ff0000 75%, #ff0000 100%);
    flex-shrink: 0;
}

.flag-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.quito-section p {
    line-height: 1.6;
    font-size: 0.9rem;
    text-align: center;
}

.flag-caption {
    text-align: center;
    font-style: italic;
    color: #666;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

/* RESOURCES CARD - MOBILE FIRST */
.resources {
    padding: 0;
}

.resources-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.8rem;
    padding: 1rem;
    margin: 0;
}

.resource-btn {
    display: inline-block;
    color: #003366;
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.8rem 1rem;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    transition: all 0.3s ease;
    text-align: center;
    background-color: #f8f9fa;
}

.resource-btn:hover {
    background-color: #e8eef5;
    border-color: #FFB81C;
    color: #003366;
    box-shadow: 0 2px 8px rgba(0, 51, 102, 0.1);
}

/* FOOTER - MOBILE FIRST */
.parent .footer {
    background-color: #2c5282;
    color: white;
    padding: 1rem;
    text-align: center;
    font-size: 0.85rem;
    margin-top: auto;
}

.parent .footer p {
    margin: 0.3rem 0;
}

/* ====================================
   TABLET & MEDIUM SCREENS (768px+)
   ==================================== */
@media (min-width: 768px) {
    .header-top {
        padding: 1.5rem;
    }

    #course-title {
        font-size: 1.5rem;
    }

    #menu {
        display: none;
    }

    .parent .nav {
        background-color: transparent;
    }

    .navigation {
        flex-direction: row;
        max-height: none;
        border-top: 1px solid rgba(255, 255, 255, 0.2);
    }

    .navigation li {
        flex: 1;
    }

    .navigation a {
        border-bottom: none;
        border-right: 1px solid #2c5282;
        font-size: 1rem;
        padding: 1rem;
    }

    .navigation li:last-child a {
        border-right: none;
    }

    .parent .title {
        padding: 2rem 1rem;
        font-size: 2rem;
    }

    main {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 2rem;
    }

    .content-boxes {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
        padding: 0;
        margin-bottom: 2rem;
    }

    .card h2 {
        padding: 1rem;
        font-size: 1.3rem;
    }

    .about-me > *:not(h2) {
        padding: 0 1.5rem;
    }

    .about-content {
        flex-direction: row;
        gap: 1rem;
        margin-bottom: 1.5rem;
        padding: 1.5rem 1.5rem 0 1.5rem !important;
    }

    .about-content p {
        flex: 1;
        font-size: 1rem;
    }

    .profile-img {
        width: 150px;
        height: 150px;
    }

    .about-me h3 {
        font-size: 1.1rem;
        margin: 1rem 0 0.5rem 0;
    }

    .quito-section {
        flex-direction: row;
        align-items: flex-start;
        margin: 1rem 0;
    }

    .quito-section p {
        flex: 1;
        font-size: 0.95rem;
        text-align: left;
    }

    .flag-caption {
        font-size: 0.9rem;
    }

    .resources-grid {
        grid-template-columns: 1fr;
        padding: 1.5rem 1.5rem;
        gap: 1rem;
    }

    .resource-btn {
        font-size: 1rem;
    }

    .parent .footer {
        padding: 1.5rem;
        font-size: 0.95rem;
    }
}

/* ====================================
   DESKTOP & LARGE SCREENS (1024px+)
   ==================================== */
@media (min-width: 1024px) {
    .resources-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}